TURK, I checked my records and found the following loads with which I'd had good results:
100gr Sierra BTS
38.0gr IMR-4895
43.5gr IMR-4350
I believe these are or are near maximum loads--suggest you back off a couple of grains and work upwards to a safe-in-your-gun load.

In 85gr Nosler semi-spitzer and Win JHP I had good results with:
45.0gr IMR-4350
38.6gr IMR-4895
Likewise, these loads are probably near max.

Good shooting--the .243 is an excellent caliber and is good for hunting varmints, the small Texas whitetails, and paper-punching.

I use IMR 3031. I've only loaded the 70-grain Hornady spirepoint, and the Sierra 85-grain HPBT.

MAX! loads I use are 40.0 and 37.5 grains, respectively. Don't start there; back off two or three grains and watch for pressure signs.

I get groups under 1/2" with these loads.

I tried some Nosler 100-grain bullets, but I was disappointed with the group size. I think it's the possibly-too-slow twist in my barrel...Been too lazy to check, since the 85-grain seems to do as much damage as I need.

Before I started reloading, I visited a ranch in Montana. They set me up with a 3 rifles to shoot prarie dogs. 220 Swift, 17 Remingtom, and .243. The .243 was the best. It flipped the prarie dogs out of the holes, while the other calibers allowed them to slide down the holes.

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